Application of sludges from water treatment plant and from sewage treatment plant in degraded soil

The objective of this study was to evaluate the effect of Sludge Water Treatment Plant (WTP) in degraded soil in the presence and absence of sludge Sewage Treatment Plant (STP), in the millet productivity and in the soil fertility characteristics. The experimental area was due to materials deposit from the construction of ETE Padilha Sul, in Curitiba, Parana, Brazil. The randomized blocks were arranged in split plots and a witness, being the main plot, constituted by the absence and presence of STP sludge (77 Mg. ha(-1) Total Solids - TS) and subplot by doses of WTS (24, 37 and 61 Mg. ha(-1) TS). It was concluded that the application of WTS had no effect on the productivity of millet, nor about the proportion of elements evaluated in the soil. However, in the presence of sewage sludge, its application was favorable to the dynamic of nitrogen until the dose 37 Mg. ha(-1) and the application of sludge STP neutralized the exchangeable aluminum, increased the pH, calcium, carbon, phosphorus and base saturation, and reduced the potential soil acidity.